Unicode includes Line Separator U+2028 and Paragraph Separator U+2029
line ending characters. The readlines method of the file object returned
by the built-in open does not treat these characters as line ends
although the object returned by codecs.open(..., encoding='utf-8') does.

The attached program creates a UTF-8 file containing three lines with
the second line ended with a Paragraph Separator. The program then reads
this file back in as a text file. Only two lines are seen when reading
the file back in.

The desired behaviour is for the file to be read in as three lines.